Plasma CXCL8 and MCP-1 as biomarkers of latent tuberculosis infection
Selvavinayagam, S. T.; Aswathy, B.; Yong, Y. K.; Frederick, A.; Murali, L.; Kalaivani, V.; Jith, K. S.; Rajeshkumar, M.; Anusree, A.; Kannan, M.; Gopalan, N.; Vignesh, R.; Murugesan, A.; Tan, H. Y.; Zhang, Y.; Chandramathi, S.; Sivasankaran, M. P.; Govindaraj, S.; Byrareddy, S. N.; Velu, V.; Larsson, M.; Shankar, E. M.; Raju, S.
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BackgroundEarly detection of latent tuberculosis infection (LTBI) is critical to TB elimination in the current WHO vision of End Tuberculosis Strategy. MethodsWe investigated whether detecting plasma cytokines could aid in diagnosing LTBI across household contacts (HHCs) positive for IGRA, HHCs negative for IGRA, and healthy controls. We also measured the plasma cytokines using a commercial Bio-Plex Pro Human Cytokine 17-plex assay. ResultsIncreased plasma CXCL8 and decreased MCP-1, TNF-, and IFN-{gamma} were associated with LTBI. Regression analysis showed that a combination of CXCL8 and MCP-1 increased the risk of LTBI among HHCs to 14-fold. ConclusionsWe postulated that CXCL8 and MCP-1 could be the surrogate biomarkers of LTBI, especially in resource-limited settings.
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